However, if either or both spouses seek complete satisfaction orgasm by cooperating in any sort of act which is not open to new life, that act is not marital. Boys and girls coming to maturity without solid formation in a stable family are ill prepared to assume adult social responsibilities. Unlike masturbation where you just need to ask yourself, relationship sex requires you to get many more things coordinated for it to work and occur. If such acts are intended to serve in some way as means to the marital good—by maintaining intimacy when intercourse is impossible, satiating the sexual urge during a period of separation and so lessening temptation to commit adultery, treating sexual dysfunction, and so on—they are morally bad means to an ulterior good end.
Thus, just as incomplete marital acts share in the moral character of marital intercourse, any nonmarital incomplete sexual act directed toward a complete one shares in all the factors that make the corresponding complete act wrong. Motivated by the unselfish willing of marital communion, marital chastity enables husbands and wives to overcome such attachments, feelings, and inhibitions, and so to engage in genuine marital acts and grow in marital communion. Provided the couple willingly and lovingly do what is suited to cause conception when the other necessary causal factors are given, their human act is marital even if they know that those factors will not be given—that they are infertile, temporarily or permanently—due to causes extrinsic to their action. Or do you not know that your body is a temple of the Holy Spirit within you, which you have from God, and that you are not your own?